acid-base reactions, buffers, electrochemistry, molecule ball-stick model stuff, experimental questions about chemical reactions, and of course balancing equations...for the 2003 one, there was a question about light absorption...that was it for the one i took...i got a 3.

Yeah, the 2003 free response questions and answers are available online on the AP Central website. It was about Beer-Lambert's Law and the relation of molarity to absorbance. It most likely won't be on the 2004 free-response (the one I'm taking this year), but may be on the multiple choice.